impact analysis on esf design ympo action item #88-1995

Impact Analysis on ESF DesignFor

Calico Hills Penetration and Exploratory DriftAnd

Tuff Main Extension to Limits of the Repository Block

YMPO ACTION ITEM #88-1995

Prepared By:J. Grenia and L. Weyand

OfFenix & Scisson, Inc.

101 Convention Center DriveLas Vegas, NV 89109

November 15, 1988

Prepared ForU.S. Department Of EnergyNevada Operations Office

Under Contract DE-AC08-84NV10322

DISCLAIMER

This report was prepared as an account of work sponsored by the UnitedStates Government. Neither the United States nor the United StatesDepartment of Energy, nor any of their employees, makes any warranty,express or implied, or assumes any legal liability or responsibility forthe accuracy, completeness, or usefulness of any information, apparatus,product, or process disclosed, or represents that its use would notinfringe privately owned rights. Reference herein to any specificcommercial product, process, or service by trade name, mark,manufacturer, or otherwise, does not necessarily constitute or imply itsendorsement, recommendation, or favoring by the United States Governmentor any agency thereof. The views and opinions of authors expressedherein do not necessarily state or reflect those of the United StatesGovernment or any agency thereof.

Printed in the United States of AmericaAvailable from:

National Technical Information ServiceU. S. Department of Commerce5285 Port Royal RoadSpringfield, Virginia 22161

Price: Printed CopyMicrofiche AOl

Impact Analyses on ESF Design

for

Calico Hills Penetration and Exploratory Drift

and


YMPO ACTION ITEM # 88-1995

Prepared by:

J. Grenia and L. Weyand

of

Fenix & Scisson, Inc.

101 Convention Center Drive

Las Vegas, NV 89109

November 15, 1988

Prepared for:U.S. Department of EnergyNevada Operations Office

Under Contract DE-ACOB-84NV103221

Impact Analysis on ESF Design

For


And


ABSTRACT

The study covers the impacts on project costs, schedule, human resources andengineering designs caused by increases in site characterization activityconsisting of penetration of the Calico Hills formation by ES-1 shaft withexploratory drifting to the Ghost Dance fault and/or drifting 10,000 feetsouthward from the MTL ESF test complex area to the end of the futurerepository block.

The Calico Hills penetration activity consists of deepening ES-1 from the MTLto the Calico Hills after ES-1 is equipped from surface to the MTL. Thiscould be done immediately after equipping or at a later date. The impacts ofeither schedule would be as follows:1) Design and construction of a second sinking stage would be required2) Expansion of the utility infrastructure on the MTL3) Removal of some shaft equipage if sinking below the MTL is delayed4) Modification of the ES-1 headframe5) The work would require one year and cost $3,380,000

Future exploratory drifting of approximately 1000 feet on the Calico Hillslevel will create the following impacts:1) Twenty additional subsurface personnel2) Additional mining equipment3) Utility capacity increases4) The time required would be 318 shifts and the cost would be $2,188,000

An increase in exploratory drifting activity of 10,000 feet would causeimpacts to the design, construction, testing and schedule as follows:1) Increased subsurface ventilation fan capacity and reuse of more air2) Increased subsurface population3) Increased utility capacity4) The construction schedule would be lengthened by 475 to 800 days5) The mapping and testing personnel would be increased and mapping time

increased by 39 weeks

TABLE OF CONTENTS

Part 1 -

Part 2 -

Appendix

Appendix

Appendix

Appendix


Extension of Exploratory Drifting on Repository Level

A - Testing Impacts

B - Ventilation Impacts

C - Calculations on Extension of Exploratory Driftingon Repository Level

Conclusions on Options and Features Evaluated

Exploratory Drifts

Excavation Cycles

Hoist Duty Cycles

FS-ST-0024 Design Mining Rates

Imbricate Fault NW

Ghost Dance Fault

Prepared by YUCCA Mountain Project (YMP) Participants as part of theCivilian Radioactive Waste Management Program. The YMP Project ismanaged by the Waste Management Project Office of the U. S. Departmentof Energy, Nevada Operations Office. YMP Project work is sponsored bythe U. S. Department of Energy, Office of Civilian Radioactive WasteManagement, Washington D.C.

TABLE OF CONTENTS

Part 1 - Calico Hills Penetration and Exploratory Drift

Part 2 - Extension of Exploratory Drifting on Repository Level

Appendix A - Testing Impacts

Appendix B - Ventilation Impacts

Appendix C - Calculations on Extension of Exploratory Driftingon Repository Level

Appendix D - Conclusions on Options and Features Evaluated

Attachment 1 - Exploratory Drifts

Attachment 2 - Excavation Cycles

Attachment 3 - Hoist Duty Cycles

Attachment 4 - FS-ST-0024 Design Mining Rates

Attachment 5 - Imbrication Fault NW

Attachment 6 - Ghost Dance Fault

PART 1

FS-DR-0002 Page 1 of 101

PART I - CALICO HILLS PENETRATION AND EXPLORATORY DRIFT

1.1 Purpose

The Calico Hills unit is an important barrier between the repositoryhorizon and the underlying ground water table. Prior to penetratingthis strata, it must be shown that there are not adverse impacts on thewaste isolation capability of the site. This analysis is to delineatethe consequences of Calico Hills level activity on the present design,construction and testing of the ESF. The analysis will also point outany impacts which can be mitigated through the Title II design effort.

1.2 Technical Scope Scenarios to be evaluated are as follows:

Option I As soon as possible after ES-1 is sunk to the Main Test Level (MTL)and equipped:

a) ES-1 shaft is deepened and Calico Hills penetration is limitedto the drill room shown on drawing R07048A/6. (figure 1.1)

b), ES-1 shaft is deepened, the drill room excavated, and anexploratory drift driven approximately 1000 ft. to the GhostDance Fault. (figure 1.2)

Option 2 After ESF drifting on the Main Test Level (MTL) is essentiallycomplete:

a) ES-1 shaft is deepened and Calico Hills penetration is limitedto the drill room shown on drawing R07048A/6. (Figure 1-1)

b) ES-1 shaft is deepened, the drill room excavated, and anexploratory drift driven approximately 1000 ft. to the GhostDance Fault. (Figure 1-2)

1.3 Assumptions:Given - (IN WMPO LETTER DHI-2334)

1.3.1 The Title II Subsystem Design Review Document (SDRD) limits theExploratory Shaft (ES-1) depth to the top of the Calico Hills.

1.3.2 After ES-1 sinking and equipping is complete, the decision can bemade to deepen the shaft and also penetrate Calico Hills.

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BASIC CHDR ESF STATION LAYOUT

FIGURE 1-1

FUTURE EXPLORATORY DRIFT (FED) LAYOUT & CROSS SECTION

FIGURE 1-2


1.3.3 Base case for this study assumes that ES-1 shaft stops just belowthe (MTL).

1.3.4 Access to test locations in ES-1 must be maintained during shaftdeepening and Calico Hills level development.

1.3.5 The primary reason for drifting on the Calico Hills level is to gainaccess to the target zone (Ghost Dance Fault). Therefore, a minimumsize drift of safe design for proposed mining equipment andpersonnel will be sufficient.

1.3.6 ESF quality of drifting will be maintained, i.e. drifting will bemapped, control drilled and blasted, minimum water usage, etc.

1.3.7 No special, large size testing equipment will be required at thetesting target area.

1.3.8 The electrical systems for the Integrated Data System (IDS) must beextended to the target area.

1.3.9 Natural water inflow from the Ghost Dance Fault may be expected tobe on the order of 250 gallons per minute.

1.4 Technical Study

The base case scenario has the ES-1 shaft stopping approximately 60 ft.below the MTL. At this point, the entire shaft is equipped with allguides, buntons, utilities, landings, ladderway, permanent conveyance,vent tube and sump materials. As designed, the ES-1 shaft will functionto support testing both underground and in ES-1 by transporting testingpersonnel to the Upper Demonstration Break Room (UDBR), MTL and variouslocations throughout the shaft.

In this study, impacts will be evaluated on present ESF design,construction, and testing, caused by extending ES-1 from the MTL to theCalico Hills level, development of the Calico Hills Drill Room (CHDR)and possible drift extension to the Ghost Dance Fault.

1.4.1 Shaft Extension

Both impacting scenarios Option 1 and Option 2 dictate that ES-1shall be deepened after the shaft is equipped. In the case ofOption 1 where the deepening is done as soon as possible afterreaching the MTL, shaft equipping would not extend below the MTL,but would stop just above the shaft station.

Shaft outfitting will interfere with suspension ropes as used forsinking from the surface to the MTL. However, through redesign andcareful positioning of work stage suspension ropes, it is possible

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1.4.1 - Continued

to suspend a new galloway from the surface using the same sheavesand winches. Special modifications would be necessary to pass theseropes through the landing grating, perhaps using pipe sleeves orremoving the grating altogether. This will eliminate the need toplace galloway winches on the MTL station.

Mucking in the lower shaft would be serviced by a guided bucketoperating on permanent guides above and below the MTL, installed asthe shaft is deepened. The arrangement of a crosshead and bucketonly, is chosen for safety reasons in lieu of a cage over crossheadarrangement. The latter results in a dangerous shock effect on thesinking stage and/or MTL landing when a cage is lowered onto asupport mechanism under normal travel conditions. If a cage isabsolutely necessary for personnel access in the shaft, the bucketcan be removed and replaced with the cage for temporary use.

Shaft bottom mucking would function as normal and hoisting ofbuckets would be done using the main 900 h.p. hoist through anoffset bucket well in the work deck. The offset well is to maintainalignment with permanent guide Fixtures in the rest of the shaft.The dump chute at the surface needs to be changed under thisarrangement to accommodate the offset conditions. The sinking workdeck for shaft extension would be a new item designed for the sameoffset features.

Due to space limitations on the MTL ES-1 shaft station, form winchescannot be accommodated. Therefore, the new sinking stage will needto be designed to handle liner form movement from the work deck ascurrently practiced on many North American projects. A crydermanwinch can be accommodated on the MTL, therefore no change inhandling procedure for mucking or drilling is anticipated.

All utilities used for shaft extension would originate from the MTL,i.e. electrical, compressed air, water, mine waste water,ventilation and testing. Systems handled in this way would be anextension of the permanent facilities installed on the MTL. Sincethe shaft extension will be equipped while being sunk, somepermanent size utility lines will be installed and used asnecessary. These are anticipated to be compressed air, water, andventilation ducting.

The above description applies for both scenarios Option 1 and Option2 except that, in the case of Option 2 where construction is delayeduntil ESF drifting on the MTL is essentially complete, additionalwork must be done. Since ES-1 would be equipped in this casethrough the MTL station and sump (about 60 ft. below the MTL), someequipping would have to be stripped from just above the shaft


1.4.1 - Continued

station to the sump, and sump pumping facilities, liners, etc. wouldneed to be removed. Enough space to construct a galloway in theshaft, and leave at least 20 ft. clearance to the shaft bottom wouldbe needed, thereby dictating the removal of a number (if not all) ofthe steel sets from the MTL to the sump bottom. This entirepreparation process is estimated at 2 weeks.

The following is included to quantify the amount of work toaccomplish the options. Impacts to the present design, if any, willbe identified.

To provide a basis for estimating a shaft sinking rate for ES-1shaft, the shaft sinking rates achieved at the White River Oil Shaleproject and at the Inco C. C. South Mine were used. At the WhiteRiver Oil Shale project, 300 feet of completed shaft was sunk permonth and at Inco's C.C. South Mine 225 feet of shaft was sunk permonth. An average of these 2 sinking rates (263 ft/month) was usedin the calculation of a sinking rate for ES-1 shaft.

A smooth wall shaft round of 14 feet diameter and 8 feet in depth isestimated to take 811 minutes. The round breaks 7.5 feet. It isassumed mapping, geologic sampling, and periodic seismic testingwill be required. Quality Assurance inspections are assumed torequire 50 minutes per round.

of 101- Continued

o Time to construct, install and modify such structures after theinitial outfitting is taken to be 5 weeks.

o With the above mentioned work being done on weekends and eveningshifts, there is no apparent impact on routine functioning.

A new sinking stage would be necessary to sink from the MTL to theCalico Hills level after the upper shaft section has been outfitted.This is due to the offset bucket well configuration, relocation ofcryderman winches on the MTL, and features necessary for handling formsfrom the work deck.

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1.4.1 - Continued

o New galloway construction is estimated to have the followingimpact:

8 weeks design6 months procurement2 weeks construction in place

o Moving and resetting winches on the MTL is taken at 2 weeks.

Cryderman winch + misc. utility winches or cranes.

o Installing new utility lines for lower shaft extension on theES-I MTL station is taken to be 1 week, design of utility linesis 2 weeks.

o Roping up all winch systems is taken at 1 week.

o Excavation of CHDR as shown on drawing R07048A/6 is estimated at3 weeks.

o Final demobilization and finish equipping is set at 3 weeks.

Total Schedule Cost impacts of extending ES-1 shaft from just below theMTL to the Calico Hills level and excavating the Calico Hills Drill roomis as follows:

o Redesign of headframe and internals 8 weeks

o Construct, modify/install 5 weeks

o Galloway - design, procure, install 36 weeks

o Subsurface site prep 2 weeks

o Utility lines - design, install 3 weeks

o Rope up 1 week

o Sink shaft 8 weeks

o Excavate CHDR 3 weeks

o Demobilization and final outfitting 3 weeks

Additive Total 69 weeks

Due to schedule overlap of activities use 52 weeks or 1 year.


1.4.1 - Continued

Cost impact is as follows:

Shaft - 777,000Internals - 836,000Mapping - 64,000Standby - 108,000CHDR Excavation - 434,000Tests - 1,063,000Engineering - 98.000

$3,380,000 Total

1.4.2 Future Exploratory Drifting (FED)

Options lb and 2b include an exploratory drift driven as anextension from the Calico Hills Drill room to the Ghost Dance Fault.This drift is approximately 1000 ft. in length, and is orientated inan assumed position for this analysis as shown in Figure 1-2.Support services for this effort will originate in the CHDR, andwill include a muck handling system, refuge chamber, and anynecessary utility substation or facilities.

1.4.2.1 Testing in the FED

Tests to be conducted along the FED and at the Ghost Dance Faulthave not as yet been determined. Therefore, it will be assumed thattests, similar to those planned for the present ESF program todetermine local rock structure and hydrology, will be conducted atthe geologic target. Also, it is assumed that drift wall mappingand rock sampling, similar to that which will take place in allother ESF drifts, will be performed.

1.4.2.2 FED Contribution to ESF Design Occupancy Level

The development and testing to be performed in the FED will occurin two distinct phases: drift mining, followed by the testingphase. Estimates of the total number and type of personnel requiredfor working the FED (construction and testing), are provided asfollows:

Mining Phase Occupancy

The estimates for Design Occupancy of the FED during mining areshown in Table 1-1.


1.4.2.2 - Continued

Table 1-1. FED Design Occupancy Level

Personnel (Types) Numbers

Construction Management 2

Mining LaborWalker (Supervisor) 1Lead Miner 1Miners 4LHD Operator 1Skip Tender I

TOTAL MINING LABOR 8 8

Principal Investigators - Mapping 5

F&S Inspection 2

H&N 2

DOE 1

TOTAL DESIGN OCCUPANCY 20

Testing Phase Occupancy

With no specific tests presently proposed, assume a total of 20persons, which include: the P.I., Geologists, Hydrologists,drilling crews, Construction Management, mining inspection, andvisitors:

TOTAL DESIGN OCCUPANCY 20

1.4.2.3 FED Size and Layout

For the purpose of this study, it has been assumed that the DriftWall Mapping Test, and the Rock-Matrix Hydrological Properties Testwill be conducted in the exploratory drift, concurrent with mining.While these tests do not affect size or orientation, they dosignificantly impact mining schedules. It is also assumed that noother tests will be scheduled to take place in the exploratorydrift.

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1.4.2.3 - Continued

As a result of the preceding assumptions, it is assumed that aminimum size drift with equipment and personnel turnouts, adequateonly to the extent that safe access to the Ghost Dance Fault targetis ensured, is required. Based on professional experience thepractical, minimum sized drift is judged to be about, 10-foot wideby 10-foot high. Therefore, it is proposed that the exploratorydrift size be 10-feet wide by 10-feet high as generally located andshown in Figure 1-2.

It is also assumed that tests at the Ghost Dance Fault will requirediamond drilling, using either water or air for cuttings removal.For the purpose of this study, it has been estimated that dry aircoring, using an IR drill rig and the Odex drill system, requires aspace 24-feet long by 24-feet wide by 12-feet 6 inches high.Therefore, a test drill room of the size required to accommodatethis equipment at the end of the exploratory drift is planned.

1.4.2.4 FED Mining Method

The mining of the FED will be accomplished by use of conventionalmining techniques (drill, blast, muck), using smoothwall blasting.Excavation of the FED will be performed by the MTL DevelopmentContractor.

1.4.2.5 FED Mining Equipment

Because of the limited extent of drifting for the FED on the CalicoHills level, it is proposed that a 3-1/2 yd. Load-Haul-DumpVehicle (LHD) be used.

A combination of a 1-boom3drill jumbo and a single, rubber tired,diesel-powered, 3-1/2 yd. LHD can support a production rate of 1round per day; which is equivalent to 55 cy of muck production perday and 10 ft. of advance per day. In addition to its primary taskof muck removal, the LHD can be used to move materials and suppliesas mining progresses.

Therefore, the recommended mining spread for the FED is as shown inTable 1-2.

Table 1-2. 1400 L - FED Equipment List

Major Equipment Required

3-1/2 yd.3 Load-Haul-Muck (LHD) ITransportation IIR CMM-2 Drill 11-boom Drill Jumbo 1Electric over Hydraulic


1.4.2.6 Muck Loading System

After ES-1 is sunk to the Calico Hills level, the CHDR is excavatedand the shaft outfitted, the exploratory drift may be driven. Sincethe shaft is outfitted, either a bucket loading arrangement or muckcar system are possibilities. For present consideration a muckhandling system comprised of cars hoisted in a cage to the surfaceis selected.

A hopper and conveyor system would be constructed at the CHDR whichwould be fed by the 3-1/2 yd LHD. A short rail system with turn-outs would accommodate small muck cars which fit into the cageplanned for ES-I (the cage designed with rails in the floor).


1.4.2.7 FED Safety Requirements

The Calico Hills safety considerations shall be similar to thoseproposed for the MTL and UDBR.

One of the main safety considerations concerns emergency escapefrom the CHDR, since this level is not connected to the ES-2.Escape from the Calico Hills can only be made via the ES-1 hoist orthe ES-1 ladderway. For this reason, a refuge chamber has beenproposed for the CHDR, as a part of the basic ESF development. Theproposed refuge chamber of 16-feet by 40-feet provides 640 squarefeet of floor space. At 14 square feet/person (standard allowance),this room will accommodate a maximum population of 40 people.

1.4.2.8 FED Utility Requirements

The mining and testing in the FED will require the same types ofutilities as other drift levels.

The assumption that the Calico Hills FED mining and testing willtake place after all other scheduled ESF development issubstantially completed means: (1) the maximum system design loadsfor most utility systems will not be increased, and, (2) theutility distribution/collection systems serving the Calico Hillslevel must be increased in size to handle the future FEDrequirements.

The following paragraphs quantifies FED utility requirements andprovides suggestions for handling modifications to utility systemsto accommodate this future drifting and testing requirement.

1.4.2.9 FED Dust Abatement

Reference Information Base (RIB) information, as referenced in theSORD, for the Calico Hills Formation in which the CHDR Level Stationand FED will be constructed, indicates that the rock may contain ahigh zeolite content. The respirable particles of dust from rock,having a high zeolite content, could be a serious health threat.

The primary dust abatement method for the FED will be to use waterand fog sprays at the face of the heading, during and after blasts,and at the muck dump. For the purpose of this study, assume that anexhaust hood at the muck dump will add at least 400 cubic feet perminute (CFM) to the ventilation air requirements. This air will beused to accelerate airborne particles into the exhaust air stream.The fog spray nozzles contemplated for use at the face and muck dumpwill require 3 gallon per minute (GPM) of water supply at eachlocation.


1.4.2.10 Water Supply Requirements

The water supply requirements for the FED are shown in Table 1-3.Based on assumption 1.3.3, the FED will not occur until after otherESF mining is substantially complete; therefore, the waterrequirements shown in Table 1-3 do not add to the total ESF waterrequirements. These figures may be added to anticipated waterrequirements shown in other studies.

Table 1-3. FED Water Requirements List

Total AddedPurpose to CHDR

System*

Mining/Drilling/Wet Core Drill Testing 7.5 GPM

Personnel (20 people @ 0.10 GPH) Negligible

**Fire **

Dust Abatement at Face 4 GPM NotAdditive)

Total 7.5 GPM

*GPH - Gallons Per Hour, GPM * Gallons Per Minute**Assume use of dry-type extinguishers in FED

1.4.2.11 FED Water System Description

The proposed water supply line in ES-1, to be used to supply waterfrom the MTL for the basic CHDR development, will be adequate tosupply the Calico Hills FED requirements.

1.4.2.12 Waste Water Control

As in the development of all other ESF underground space, the use ofwater in the mining and testing of the FED shall be minimized.

1.4.2.13 Waste Water Removal

In addition to the removal of mining (drilling) water, F&S hasassumed that up to 250 GPM of water inflow could occur at the GhostDance Fault. This is a significant flow, as compared to therequirements for mining at the FED. Therefore, it is recommendedthat system capacity, capable of handling this future potentialflow, be incorporated into the design and construction of theinitial basic ESF Waste Water Removal System.


1.4.2.13 - Continued

Portable air-powered collection pumps, combined with an electrical-powered pumping system for larger flows, pumping into an extendablepiping system, as described for other ESF drifting, will be requiredat the FED. This system will be used to convey mine waste water tothe MTL sump.

1.4.2.14 FED Compressed Air

The FED will require compressed air, but since it is assumed the FEDwill follow basic ESF development, the FED requirement will not addto the ESF compressed air design requirements.

A system used to distribute compressed air to the FED will berequired to supply the amounts shown in Table 1-4, to meet the FEDcompressed air requirements (demands).

Table 1-4. FED Compressed Air Requirements List

RequirementPurpose (*SCFM @ 90 psia)

MiningDrilling 125Waste Water Removal Sump Pump 8

TOTAL MINING DEMAND 133

TestingDrilling (Hi-Pressure Drill and Equip) 907Waste Water Removal Sump Pump 8

TOTAL TESTING DEMAND 915

These quantities of compressed air can be supplied along thedrift using an extendable 4-inch diameter piping system.

*SCFM - cubic feet per minute at standard temperature andpressure.


1.4.2.15 FED Electric Power

The minimum requirements for electrical power to be supplied to theFED are listed in Table 1-5.

Table 1-5. FED Electrical Power Requirements List

1.4.2.17 FED Excavation Production. Schedule. Manpower and Supply Estimates

The estimates that summarize the major factors established by therequirements for FED mining and testing operations, and theirassociated costs and schedules, are provided in the followingparagraphs.

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1.4.2.18 Excavation Production

The excavation production values (quantities and rates) associated withthe mining and testing of the FED and Test Drill Room (TDR) are:


Table 1-6. FED Major Mining Materials Requirements List

Material (Units) Ouantity

Explosives

Water Gel (pounds) 34,000

Caps (ea) 4,500

Detonating Cord (feet) 11,000

Rock Bolts (6-foot long ea) 910

Wire Mesh (square feet) 15,000

1.4.2.21 FED Development Costs

Schedule and cost impacts as a result of mining 1000 feet of driftto the Ghost Dance Fault are the same for both scenarios mentionedin Option 1 and Option 2.

o Time = 1 day/round x 106 rounds - 106 days

use 110 days

o Cost impact

Mining - $1,695,000Mapping - 100,000Standby - 178,000Capital - 215,000

Total $2,188,000


1.4.3 Conclusion

The consequences of each option mentioned in Section 1.2 of thisreport were evaluated for impacts of hoisting, ventilation,electrical, utilities, population and schedule on the present ESFconfigurations for design, construction and testing. The basic ESFdesign as described in the 50% Title I review package includedprovisions for sinking ES-1 to the Calico Hills level and excavationof the CHDR. In all cases the effect was no impact. That is to saythat as currently planned, the activity of extending ES-1 from theMTL to the Calico Hills level, excavating the CHDR, and driving 1000feet of drift to the Ghost Dance Fault will not cause anysignificant changes in our currently designed systems, nor will theyexceed the capacities of any system. Base case-development andconstruction of the currently designed spatial configurations,mechanical/electrical systems, utility systems and testing programsis a stand alone system which will function normally regardless ofthe addition of Calico Hills activity.

As the text points out, Calico Hills development is not without itsown inherent costs and schedule. The scope of work would requireadditions of various components in each system mentioned above, andwould carry its own development schedule and applicable costs. Anindication of those times and cost figures is included in the text.Each system has been examined as to how it would function and inter-relate to the current systems' capacities. If Calico Hillsdevelopment is activated as an option, procurement, construction andcost, impacts should be considered under a separate program phase ofESF development.

Since no adverse impacts were found to exist, no mitigating actionscan be identified as part of the Title II design effort.

PART 2


PART" - EXTENSION OF EXPLORATORY DRIFTING ON REPOSITORY LEVEL

2.1 PURPOSE

The current lateral extent of excavation at the repository level may notprovide the representative information needed to construct a reliablethree-dimensional model of the repository block and to evaluate rangesof parameters that affect repository performance.

This analysis is to evaluate the consequences of constructing a longdrift south in the future repository to develop additional sitecharacterization information and to determine what future impacts, ifany, can be efficiently mitigated during presently proposed Title II ESFdesign.

2.2 ASSUMPTIONS

2.2.1 Given in WMPO Letter DHI-2334

o An exploration drift is required to cross the main repository blockto access southern portions of the future repository.

o The drift defined by points "A" to "F" on interface drawingR07048A/1 will be extended to the SW, along the centerline of therepository mains to the limits of the block.

2.2.2 F&S derived assumptions

o The ESF, as designed and presented at the 50% Title I Review, isconsidered the present baseline facility, against which the variousextended drift options will be evaluated.

o The SDRD requirement to provide for a 100% expansion of the MTL testareas must be maintained, and this expansion will occur afterpresent MTL development is complete. The extended south drift is inaddition to this requirement.

o Redundancy of power and utility systems in the present design mustbe maintained.

o Impacts upon present IDS design and facilities were not included inF&S evaluations.

o The type and size of mining equipment presently planned for ESFdevelopment will be used on extended drifts, or a more effective.combination may be substituted.

o The development of either one or two parallel drifts will notadversely impact site characterization.


2.3 TECHNICAL FACTORS TO BE EVALUATED

2.3.1 Drift Opening - What are the recommended drift openings?

2.3.2 Ventilation - What is the recommended ventilation system?

2.3.3 Drift Configuration - What is the recommended drift configuration?

2.3.4 Option 1 - The extended drifting is to be accomplished as soon aspractical in site characterization.

2.3.5 Option 2 - The extended drifting is to be accomplished after thecompletion of the currently planned drifting for ESFunderground tests (i.e. MTL and 3 exploratory driftscomplete).

2.3.6 Option 3 - The extended drifting is accomplished concurrently withdrifting on the Calico Hills level.

2.3.7 Present ESF Capabilities - What potential scope of work and schedulecan the presently planned ESF support?

2.4 IMPACT ANALYSIS METHODOLOGY

The methodology used in evaluating the impacts of the proposed southdrift extension upon the presently proposed ESF consisted of thefollowing activities. Major results of each of the activities are shownunder each section, together with references to support analysesprovided in this impact analysis.

2.4.1 Select appropriate extended drift cross-section.

o A 14 ft. x 14 ft. drift section recommended for the long,horizontal ESF exploratory drifting, was also selected as thebasis for this impact analysis and efficient equipment operation.

o See Appendix D for supporting rationale.

2.4.2 The various ventilation system options for the extended driftingaddition were evaluated.

o The present two down-cast shaft systems, and surface fans areadequate to supply ventilation air for the present MTL, andfuture CHDR and extended drift development. A significantincrease in subsurface fan horsepower will be necessary to supplyair for development and testing in the extended south drift.

o Conversion of the entire ESF ventilation system to a "flow-through" ventilation system, will provide better ventilation airefficiency, reduced connected fan horsepower, and greater systemoperating flexibility.


2.4.2 - Continued

o See Appendix B for supporting rationale and calculations.

2.4.3 Two drift configurations were considered:

o A single 14 ft. x 14 ft. drift, for minimum mining excavation ofthe extended drift development.

o Two 14 ft. x 14 ft. drifts for maximum mining advance rate,safety, traffic and ventilation system efficiency.

o Support rationale and calculations are shown in Appendix C.

2.4.4 The maximum capability of present ESF system designs which could beimpacted by the extended south drift were extracted from completed or"in-progress" ESF calculations.

These maximum system capabilities are shown in Table 2-1 togetherwith the present ESF design requirements, and allowances set aside toprovide for expansion of MTL test areas. The remaining flexibilityallowance is available to service, or support the development of thesouth drift.

2.4.5 The various mining and hoisting production and system capacities forOptions 1 and 2 were developed.

Table 2-2 indicates the results of this analysis for one and twoheading developments, as well as the use of LHD and the combinationof LHD and truck muck transport.

Support rationale and calculations are shown in Appendix C.

(1) Requires that some reallocation of personnel and materialtransport will be made to ES-1

(2) Presumes that regulatory acceptable reuse of ventilation air will be allowed

(3) Present estimate, subject to change

(4) Based on emergency evacuation capabilityTABLE 2-1

PRESENT ESF MAXIMUM SYSTEM CAPABILITIES

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Table 2-2

Mining & Hoisting Rates for Various Options

No. of Headings

Total New DriftFootage

Total New Driftyd

Total New DriftTons

New Driftft/day

New DriftTons per day

Actual TonsTo hoist per day

Total NewDrifting days

Total Dev. DaysFrom start of MTL

Overall Extensionof Present Schedule(days)


2.4.6 The various utility system requirements for Options 1 and 2 weredeveloped.

o It is estimated that approximately 40 gpm water supply is required tosupport mining in options I and 2. The additions of this amount hasno impact upon the present ESF design water supply capacity, which isset by fire protection requirements.

o Collection of the above 40 gpm as mine waste water, will not impactpresent ESF design or systems.

o The present ESF Mine Waste Water Sump near the ES-1 on the MTL, willhave adequate space provided for this additional waste water. This,plus present plans to provide a discharge pipe in each shaft,provides full redundant capability for handling the present ESF MineWaste Water full design flow. Thus the system, as presentlydesigned, will handle up to 1000 gpm of unexpected ground water,should it be encountered.

o A 300 SCFM compressed air allowance is included to allow forhorizontal core drilling in the extend drifts. This amount has noimpact upon the presently designed system.

2.4.7 Present ESF Capabilities

The preceding analyses indicate that both concurrent or sequentialdevelopment of the MTL and extended development (both south drift andCHDR) are possible. The only major impact to the present ESF systems isto the electrical power system. This impact can be mitigated byproviding space for a future mine cable in each shaft and space for MTLswitchgear additions. Therefore, the existing ESF systems can supportall presently envisioned development required for sitecharacterization.

Although a portion of this concern is addressed in Tables 2-1 and 2-2,in-depth evaluation of the ultimate capacities and limits of the ESF issufficiently complex so as to prohibit its analysis within the allottedscope of this study.

Additional flexibility can be realized by:

- Utilization of ES-1 to handle personnel and materials which wouldincrease muck hoisting capacity at ES-2.

- Convert the ventilation system to a more optimum flow-throughconfiguration.

2.5 CONCLUSIONS

The addition of a drifting program to explore approximately 10,000 ft.to the SW edge of the repository block, would not have any prohibitiveimpacts on the presently planned ESF design construction and testing.


2.5 - Continued

If this development is done concurrent with the presently planned ESFdevelopment, minor impacts to some of the existing systems willresult. Better ventilation efficiency, utilities, underground miningequipment and provisions for human occupancy must be provided. Thehoisting plan is adequate. The schedule for the completion of thepresently planned development and testing would not be significantlyaffected. The impact of providing for the items listed above, couldeasily be mitigated in Title 11 design.

If the additional drifting is done after presently planned ESF programis complete, very little adverse impact would result.

The information presented in Tables 2.3, 2.4 and 2.5 support the finalconclusion that no significant adverse impact to the presently designedESF will be experienced through the expansion of the Tuff Mainexploratory drift to the southern limits of the proposed repositoryblock. As currently designed, mechanical and functional concepts of theESF embody sufficient flexibility and capacity to operate either inconjunction with, or in addition to, an expanded scope of undergrounddevelopment.

It should be recognized that certain system requirements attributed tothe additional 10,000 ft. of drifting can be optimized through judiciousengineering in Title II efforts. Specifically, the extreme ventilationhorsepower requirements for expansion, and its inherent impact ofphysical electrical system changes, can be mitigated by altering theinitial ventilation concept to a flow-through system. Since thepossibility of this change for expansion purposes has been recognizedthroughout development of the ESF design, the current layout maintainsthe flexibility for change to accommodate various operational needs. Asalways, design modifications incorporated as early as possible in theTitle II effort would ensure maximum optimization and integration amongall project components of electrical systems, utilities and physicallimitations.

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TABLE 2-3

OPTION 1

o "Drifting is to be accomplished as early as practical in sitecharacterization."

EXISTENCE OF IMPACT ON PRESENTLY DESIGNED FACILITY

(1) Even though the present system may be adequate, a conventional flow-through ventilation system for the entire ESF would result in substantialinstallation and power cost savings. A redesign of the present MTL layoutand ventilation system would be necessary.

(2) Extension of the present exhaust duct system to service the extended southdrift will add approximately 1800 KVA to the ESF 4160V power systems.This will require larger 4160V mine cables, presently designed as 350 MCMmine cables (about maximum size). Later design could consider dropping 2additional mine cables, with no other present design consideration otherthan providing space in the shaft arrangement.

Present design of the MTL substation has space for added switch gear, sono impact is obvious.

(3) Construction and Testing population will increase hoist use for personneltransport, but can be mitigated by allocations of more transport to ES-1.

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TABLE 2-4

OPTION 2

o "Drifting is to be accomplished after MTL development is essentiallycomplete."


(1) Even though the present system may be adequate, a conventional flow-through ventilation system for the entire ESF would result in substantialinstallation and power cost savings. A redesign of the present MTL layoutand ventilation system would be necessary.

(2) Extension of the present exhaust duct system to service the extendedsouth drift will add approximately 1800 KVA to the ESF 4160V powersystems. This will require larger 4160V mine cables, presently designedas 350 MCM mine cables (about maximum size). Later design could considerdropping 2 additional mine cables, with no other present designconsideration other than providing space in the shaft arrangement.

Present design of the MTL substation has space for added switch gear, sono impact is obvious.

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TABLE 2-5

OPTION 3

o "Drifting is to be accomplished concurrently with Calico Hills development.


Extension of the present exhaust duct system to service the extendedsouth drift will add approximately 1800 KVA to the ESF 4160V powersystems. This will require larger 4160V mine cables, presentlydesigned as 350 MCM mine cables (about maximum size). Later designcould consider dropping 2 additional mine cables, with no otherpresent design consideration other than providing space in the shaftarrangement.

Present design of the MTL substation has space for added switch gear,so no impact is obvious.

Construction and Testing population will increase hoist use forpersonnel transport, but can be mitigated by allocations of moretransport to ES-1.


APPENDIX ATESTING IMPACTS

I. Test Related Activity Associated with Sinking of ES-1 Shaft from MTL toCHDR and Development of an Exploratory Drift to the Ghost Dance Fault onthe CHDR Level.

The testing that has been proposed in the Appendix B of SDRD revisiondated July 31, 1987, for those areas that would be located below the MTLhave been reviewed to determine what resources would be required shouldES-1 be sunk to the Calico Hills formation.

The purpose of this section is to assess the impact on the design,schedule and construction should ES-1 be sunk from the MTL to the CalicoHills Drill Room (CHDR) Level. The impact is quantified in terms ofnumbers of schedule weeks required to accomplish the actual test drillingand installation, the IDS (DAS) additional requirements and additionalsupport services that would be required over and above those that wouldbe needed for those tests at or above the MTL. The scope of the impacton the construction and configuration of the shaft and stations isaddressed elsewhere.

The following tabulation of schedule impacts resulting from conductingtests in the ES 1 and on the CHDR is based upon recently furnishedconstruction schedule information.

Shaft Mapping- 295 ft @ 4 hr/7ft * 169 hrs.Radial Bore Hole Test - 4 places @ 2 wks/eaShaft Convergence Test - 1 place @ 2 wks/eaHydro Chemistry and CH/36 - no impactCalico Hills Test - Drilling and Set-up of testDiffusion Test - Drilling only (set-up concurrentwith Calico Hills Test)Overcore Stress Test - Concurrent w/above noadditional impactMapping on CHDR Station AreaMapping of Exploratory drift to Ghost Dance Fault 1000Exploratory Drilling at the Ghost Dance FaultDrill hole instrumentation (piezometers, temperaturesensors, water samplers, etc.)

Total

Note: Mapping Crews for shaft deepening and CHDR driftingsince mapping will be done on MTL concurrently.

will be extra

Total additional weeks of testing activity below the MTL will beapproximately 30 weeks. This estimate does not reflect delay to thestart or completion of scheduled MTL tests but rather assumes that theadditional human and material resources will be furnished to avoiddelays to testing on the MTL.


Additional material resources that would be required to accomplishtesting below MTL are listed below. These resources are only thosedirectly related to proposed tests. No attempt has been made toassess the impact on power or water consumption since these items areassumed to be required for the shaft and station developmentregardless of testing needs.

Item QuantitY

1. Booster Compressor for Calico Hills and Diffusion 1test dry drilling (extra)

2. DAS and transformers on CHDR Level 2

3. DAS units in the shaft for Radial Bore Hole Tests 3

4. Ventilation Air Filtration unit required for drydrilling dust removal 1

5. Temperature Gradient Measurement Devices Unknown

6. Piezometers & well screens Unknown

7. Core Drill (Electro Hydraulic column mounted) 1

8. Wiring in shaft to MTL Not Quant.

9. Additional IDS capacity (May not be required) Not Quant.

The additional human resource requirements created by testing planned belowthe MTL are not clearly identifiable for the following reasons:

(1) The test management group has not made an assignment of requiredpersonnel for tests contemplated on the CHOR Level.

(2) The tests contemplated for CHDR level can be operated concurrently withsome MTL scheduled tests with the same personnel.

(3) No additional test construction personnel may be required for wiring andtest facility installation. An additional group of drill crews will berequired, to accomplish drilling in the exploratory drift and CHORstation area.

Testing activity in areas below the MTL will have an effect upon. theutilization of the ES-1 shaft and hoisting system. Evacuation of testingpersonnel from the CHDR will increase the ES-1 hoist capability requirements.ES-1 shaft availability for supply and equipment lowering to the MTL will bereduced or virtually eliminated during test development and operations on theCHDR since the ES-1 is the only access to the CHOR and any significant tie-upof the ES-1 hoist would prevent emergency evacuation of CHDR Level personnelexcept to ladderway.


II. Test related activity associated with development of a 10,000 feet long1exploratory drift driven from near the ESF core area in a Southerlydirection.

The following tests will be assumed to be conducted during or after thecompletion of a 10,000 feet long exploratory drift driven to theSoutheast through the center of the proposed repository block on the maintest level.

- Drift wall mapping and photographing.- Rock matrix hydrologic properties (sampling).- Horizontal exploratory core drilling.- Bulk permeability testing.

Comprehensive test planning at a later date may indicate that the scopeof the testing in this exploratory drift should be expanded. Ampleprovisions for power, water, and ventilation should be made for anexpanded testing program.

The reasons for assuming that the above listed tests will be conductedare as follows:

- Drift wall mapping and photography is scheduled for allexcavation work.

- Rock matrix hydrological properties involves sampling larger rockfragments, this is planned for all other excavation work at the ESF.

- Horizontal core drilling at selected intervals along the course of thedrift is appropriate. The exploratory drift affords an excellentopportunity for accomplishing exploratory core drilling to the Eastand West of the drift and thereby gain valuable information concerningthe mineralogy, petrology, structure, and hydrological properties ofthe proposed repository rockmass.

- Bulk permeability testing is reasonably assumed because the presentplanning for this shows several locations as far from each other aspossible. The purpose being to characterize a rock mass that is asfeasibly representative of the whole.

The following tabulation of schedule impacts resulting from conductingthe assumed tests listed above is based upon construction scheduleinformation prepared for the presently planned ESF development:

- Drift wall mapping and photography 10,000 feet - 20 wks- Rock Matrix Hydrologic properties (no impact) - 0- Exploratory Core Drilling - excavation of Alcoves

18'x 28' x 14' high at 2000 feet intervals, 5required - 5 wks

- The core drilling can be carried on during thedrift construction, therefore the only impact onthe schedule will occur at the end of the driftwhere 500 feet long holes might be drilled. Thiswould require - 12 wks


Bulk permeability testing - this test(s) will requiredry mined alcoves and dry drilled holes, along withconstruction of a DAS at each location. Assume aminimum of four locations. Twenty feet of each alcoveadvances past the proposed test location. All othertest excavation and drilling could be done later andwould have a later impact on the drift and constructionschedule. Four locations at 20 feet each X 1 day/10feet plus DAS Alcoves will require.

- 2 wksTotal Schedule Impact - 39 wks

Additional Material resources that would be required to accomplishtesting in the 10,000 feet long exploratory drift are as follows:

No. of ItemsCore Drill capable of drilling 1000 feet of HQ. sizehole 1Mapping (scissor lift) vehicle 1Camera and lighting equipment 1DAS station 4

Additional Human Resources that would be required to accomplishtesting in the 10,000 feet long exploration drift are as follows:

Number of Persons

Drift Mapping Crew 4Core Drill Crew 6Laboratory Personnel (extra) 1

Total 11

The above quantity estimate is based upon the assumption that,regardless of the scheduling of the drift, the logistics of thesituation will require that the test activity in the 10,000 feet ofdrift be supported by separate equipment and crews at sometime duringthe ESF project.

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VENTILATION IMPACTS

This section deals with the impact of ventilation requirements relative toboth Part 1 and Part 2 studies on the present ESF design, construction andtesting features. Impacts were evaluated while considering the case involvingthe most stringent air flow requirement. The worst case considered is thesimultaneous development of the exploratory drifts and the operation of theMTL. Under this assumption, the following SDRD requirements apply:

2. Calico Hills' 10'x 10'x 1000' drift development to GhostDance fault and ESI shaft station areas below MTL-22,000 cfm.

(To support one 3.5-yards loader)

3. MTL Imbricate's 14'x 14'x 1300' drift development-40,000 cfm.(To support one 5-yard loader and one utilityvehicle.)

4. MTL Exploratory Drifts-60,000 cfmTo support: a) 14' x 14' x 500' Tuff Main Access

b) 14' x 14' x 1670' Drill Hole Wash Drive

c) 14' x 14' x 400' Access Drive to GhostDance and Tuff Main Long Drift

d) 14' x 14' x 1150' Ghost Dance Drivee) 14' x 14' x 10,000' Tuff Main Long Drift

to Southwest Boundary of ProposedRepository Block (Single or Double Entrydrives.

Note that the air quantity supply canonly support two 5-yard3 loader andone utility vehicle or one five-yard3 loader, two 8.8-yard3 trucks(13-ton each), and one utilityvehicle at any given time in thearea.


The Ventilation system can be designed to support these activities. Directionto alter the current design in order to incorporate these additional featureswould be needed by 30% of Title II.

Impacts of the expansion:

1. Calico Hills' 10' x 10' x 1000' drift to Ghost Dance Fault

o Air quantity requirement - 22,000 cfm

o Ventilation duct 30' 0 x 1000' long.

o Two 50 HP fans in series, spaced at 500' apart.

2. Tuff Main's 14' x 14' x 10,000' Long drift to Southwest Boundary ofProposed Repository:

o Air quantity requirement - 60,000 cfm.

o Ventilation duct 48" 0 x 11,000' long.

o Ten 175 HP fans in series, spaced at 1000' apart.

o Single entry 10,000 ft. drive would incur the roughcosts of:

a) $ 550,000 Ducting (11,000 ft. @ $50/ft.)b) 250,000 Electrical changes to present systemsc) $ 250,000 Fans 10 - 175 H.P. ea.

$1,050,000 Total

o If double entry concept is chosen, roughcosts amount to:

a) $100,000 Ducting (2,000 ft @$50/ft)

b) 75,000 Electrical changes to presentsystem

c) $ 45,000 Fans$220,000 Total

3. Additional time requirement to design the system, supported bycomputer simulation and modelling.

4. Safety analysis need to compare the 10,000' single drift developmentversus double entry flow-through system.


Relative to identifying an alternate mitigating design feature in a Title IIeffort, the potential exists to design the entire ventilation scheme as asimple flow-through system rather than an exhaust ducting system as currentlyplanned. This would be particularly applicable when driving the 10,000 footTuff Main exploratory drift to the South, especially in the double entryoption. A tertiary level comparison follows which outlines the advantages anddisadvantages of converting the design to flow-through ventilation:

Disadvantage of Exhaust Ducting

1. Crowded shaft, impaired visibility to liner.

2. Potential airflow expansion, flexibility nil or limited.

3. Estimated cost to fabricate and install ducting, $400,000.

4. Estimated number of days devoted solely for duct installation45 days (shaft schedule impact)

5. Surface ducting adapters and noise abatement cost estimate,$300,000.

6a. Six primary fans needed at estimated capital cost of $300,000(Excluding electrical substation, wirings and switch gears).

6b. Six primary fans to maintain and monitor for life safety.

7. Maintenance of high pressure duct and leakage losses costestimate, $100,000/year.

8. Primary System Power requirement

1000 HP

9. Ability to contain dust of the return air (only advantage)

10. Decommissioning estimate 45 days and $150,000.


Advantages of Shaft flow Through Ventilation

1. Shaft Ducting space is saved.

2. Potential for 25% expansion without much impact to the system(SDRD to be changed to increase max. shaft velocity from 2000to 2500 fpm).

3. No ducting cost.

4. No downtime for duct installation and maintenance.

5. Underground primary fan bulkhead and noise abatement costestimate, $75,000.

6a. One primary fan at estimated cost of $200,000 (Excludingelectrical substation, wirings and switchgears).

6b. One primary fan to maintain and monitor for life safety.

7. No air leakage from vent duct.

8. Primary system power requirement

350 HP

9. No decommissioning cost

Cost estimates used are industry practices without the impact of governmentquality assurance control.

There is an overwhelming advantage of the shaft flow-through ventilation overthat of the currently plan exhaust duct system. It is recommended that study-of the impacts on ESF Testing and shaft sinking schedule be made if flowthrough ventilation mode is used.


APPENDIX C

CALCULATIONS ON EXTENSION OF EXPLORATORY DRIFTING ON REPOSITORY LEVEL

CALCULATIONS

1.0 STATEMENT OF WORK

Drive an Exploratory Drift from point F on R07048A/1, southwesterlyalong the centerline of the Tuff Main, to the limit of repository block.

2.0 OPTIONS TO BE EVALUATED

1) Drifting to be accomplished as soon as practical.

2) Drifting to be accomplished after completion of drifting currentlyplanned for ESF tests (i.e., MTL test bed and alcove mining).

3) Drifting accomplished concurrent with drifting on Calico Hills level.

3.0 ADDITIONAL EVALUATIONS

1) What is recommended opening for ventilation configuration?

2) What potential scope of work and schedule can the presently plannedESF support?

3.1 Quality - Distance and Excavation Volume

Assume 14h x 14w drift same as presently planned for longexploratory drifts.

Calculation JBM-B04 for FS-ST-0024 (See Attachment #1), a drillround is designed and face area calculated at 194 ft whichincludes 4" of overbreak in back and both ribs.


3.1 Continued

Muck Volume Per Round (Drill 12 ft, Pull 11 ft)

194 ft2 x 11 ft x 1.6 Swell 3414.4126.5 yd /round

3.2 Excavation Cycle Times

In FS-ST-0024 Calc JBM-B04 (See Attachment #2), thefollowing cycle times for this round were calculated.

Muck Cycle

The muck cycle is dependent on the haul distance, type andsize of the equipment, and the number of pieces of equipment.


Horizontal Distance

Slope Distance

Horizontal Distance

Slope Distance

Pt C to the Muck Dump

3.2.2 Muck Cycle

Assume 8-1/2 mph avg. tramming speed on 5900 ft haul. Assume 6-1/2mph on 1020 ft portion of haul (turning corners, congestion, etc.)

Calculated muck cycle based on two options

1) 5 yd3 LHD's load and haul2) 5 yd3 LHD's loading an 8.5 yd3 (13 tons nom./truck)

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3.2.2 - Continued

FS-DR-0002

3.2.2 - Continued

Cycle Time

(a) Load Truck (Two trips)

(1) Load Bucket

(2) Back 250 ft at 2-1/2 mph avg.-250 ft

220 fpm

(3) Pull forward & dump in truck

(4) Back

(5) Tram to Face 250 ft220 fpm -

Page 42 of 101

FS-DR-0002

3.2.2 - Continued

Page 43 of 101

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3.2.3 Total Round Cycle Time

Two LHD'S

DrillBlastRock BoltMAPMUCK

One LHD & Two Trucks

DrillBlastRock BoltMAPMUCK


3.2.4 - Continued

(b) Using 1 LHD & 2 Trucks

- 19.5 hr/day12.4 hr/round + 1.9 hr/round

1.36 round/day x 11 ft/round

x 11 ft/round

= 15.0 ft/day

3.2.5 Assume driving parallel headings for safety reasons, 38 ft apart

If there was an equipment spread dedicated to eachheading, then one could theoretically get 13.3 ft/day withtwo LHD's or 15.0 ft/day with one LHD and two trucks,from each face.

DRIVE TWO PARALLEL HEADINGS W/ONE EQUIPMENT SPREADTwo 5 yd3 LHDs for Mucking

CDRIVE TWO PARALLEL HEADINGS W/ONE EQUIPMENT SPREAD

One LHD & Two Trucks

19.6

DRIVE TWO PARALLEL HEADINGS W/ONE EQUIPMENT SPREAD

One LHD & TWO TRUCKS

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3.2.6 SUMMARY OF AVERAGE MAXIMUM PRODUCTION RATES

4.1 Layout #1

Single 14 ft x 14 ft drift 9780 ft long with passing parking areas 25 ftwide x 50 ft long every 500 ft.

4.2 Layout #2

Two parallel 14 ft x 14 ft drifts with 38 ft wide pillar between driftsat a 14 ft x 14 ft cross cut connecting the drifts on 740 ft centers.The drifts are on the alignment of the Tuff Main and the Waste Main withthe cross cuts located per repository main cross-cuts shown on R07003A.

* With this layout, in order to establish complete flow throughventilation system, connect waste main exploratory drift to Pt-26.

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4.3 EXCAVATED VOLUMES

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4.5 ESF HOISTING CAPACITY

In F&S Analysis #FS-CA-00067 and FS-CA-0068, the duty cycles for the GFE900 HP Hoist and the GFE 1500 HP Hoist were calculated. The results aretabulated on Attachment #3.

From this Table (Attachment #3), the 1500 HP Hoist, which will be used onES-2, has a maximum production rate of 249.1 tons/hr or 227.9 tons/hr.,depending on counterweight/skip configuration. Therefore, the 127tons/day to 263 tons per day productions rates for this drifting could beaccommodated fairly easily by the hoist.

4.6 SCHEDULE OPTIONS

4.6.1 Drifting To Be Accomplished As Soon As Practical.

The earliest practical schedule would be to start driving thecurrently planned exploratory drift towards PT-F as soon as possibleduring the service core area development. In order to haveventilation, assume starting as soon as the connection between ES-2and ES-1 is complete, and the power center alcove is excavated.Also, the access around to the ES-2 muck dump has to be completed.

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EARLIEST PRACTICAL DRIFTING

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4.6.1.1 Drive DBR, Connect ES-1 & ES-2, Drive Run Around and Power Center

The total time to do this excavation (cross hatched) calculated inFS-ST-0024 was:

After shaft subcontractor demobilizes and REECo mobilizes for MTLmining.

1) Mine access to DBR, & Mine & Test DBR - 74 days(See Attachment 14,)

2) Drive Connection to ES-1 - 33 days(See Attachment 14,)

3) Drive access around to IS-2 Dump = 39 days(See Attachment #4,)

4) Excavate Power Center = 16 days(See Attachment #4,)

Total Time for 4.6.1.1 - 162 days

4.6.1.2 Concurrent With Continuing Core Area Development, Drive SD#INorthwest to Pt C.

Use Mining Time Estimate calculated for this segment in FS-ST-0024(See Attachment #5).

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CORE AREA DEVELOPMENT

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4.6.1.3 Mine Tuff Main SW to PT-F, and

(a) Drive 150 ft enlarged section

4.6.1.4 Recap Total development time before starting 9780 ft of drifting

After shaft subcontractor demobilizes and REECo ismobilized for MTL development

(a) Complete necessary core area(4.6.1.1) 162 days

(b) Drive currently planned exploratory driftto PT-F

(1) NW > PT-C (4.6.1.2) - 37 days(2) SW > PT-F (4.6.1.3) - 30 days

Single Heading Drift > 229 days

In order to make full use of a flow through ventilationscheme for the double heading drift option, drive aconnecting drift between ESF Service Drift #4, and thebeginning of the optional parallel drift at PT-F'. Usethe rate of advance from 4.6.1.3 above, to calculateadditional time for this development.


4.6.1.5 Total pre-development & drifting times from 4.4

(a) Single heading drift

(1) Muck with 2 LHDs only - 229 + 788 - 1017 days

(2) Muck with LHD & 2 Trucks - 229 + 701 - 930 days

(b) Two parallel heading with cross-cuts

(1) Muck with 2-LHDs only - 243 + 817 - 1060 days

(2) Muck with LHD & 2 Trucks - 243 + 723 - 966 days

4.6.2 Drifting to be accomplished after currently planned MTL drifting iscomplete.

FS-ST-0024 estimated 19.5 months to complete currently planned MTLdrifting after REECo mobilize for drifting.

19.5 Months X 30 - 585 days

Total Development A Drifting Time

(a) Single heading, LHDs only

(1) 585 days + 788 days - 1363 days

- Single Heading, LHD & trucks

(2) 585 days + 701 days = 1286 days

(b) Two Parallel Headings

(1) 2 - LHDs Only* 585 days + 14 days + 817 days - 1416 days

(2) LHD & 2 Trucks- 585 days + 14 days + 723 days = 1322 days

4.6.3 Drifting Accomplished Concurrent With Calico Hills Drifting

Since Calico Hills Drifting will require hoisting through ES-1andall MTL hoisting will be through ES-2, no direct hoisting conflictwill occur. Muck hoisting in ES-1 however, will require morepersonnel, material and supply hoisting through ES-2 which may cutinto muck hoisting availability.

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4.6.4 Impacting of Schedule

The present schedule for the MTL development, according to FS-ST-0024, is 585 Days for MTL after REECo takes over. Therefore,subtract 585 Days from total time for each new drift option, to getschedule impact for that option.

4.6.5 Muck Hoisting in ES-2

In FS-ST-0024, the maximum muck production was determined to be 765tons per day, which occurred while exploratory drifting and test bedmining were going on simultaneously. Assume this maximum rate willstill occur, and add the muck hoisting requirements for driving theadditional drifting concurrently.


APPENDIX D

CONCLUSIONS ON OPTIONS AND FEATURES EVALUATED

1.0 "What is the recommended opening and ventilation configuration?"

Conclusion

The recommended opening size is 14 ft x 14 ft in order to get adequateclearance for equipment, and accommodate the required ventilation duct.

Two configurations were considered as follows:

Configuration I

Single 14 ft x 14 ft drift on the centerline alignment of the TUFF MAIN,with passing/truck loading/parking areas slashed out to 14 ft high x 25ft wide every 500 ft along the drift. The total slope distance used toestimate schedule impacts was 9780 ft. This was calculated fromcoordinates and elevations shown on SNL Dwg. No. R07003A for Point F andthe SW end of the TUFF MAIN.

Configuration 2

Two parallel 14 ft x 14 ft drifts on the centerline alignment of the TUFFMAIN and the WASTE MAIN, with 14 ft x 14 ft connecting cross-cuts spacedat approximately 740 ft on the alignments of future repository blockcross-cuts. The pillar width between the parallel drifts, and thus thecross-cut lengths, is 38 ft. The total length of drifts and cross-cutsused for estimating was 20,016 ft.

In order to realize the most benefit of flow through ventilation withconfiguration #2, the addition of a connecting ventilation 14 ft x 14 ftcross-cut was included in the time estimates. This cross-cut is 230 ft.long (estimated) and extends from the NW end of drift SD #4 (near ES-i)of the ESF, to the beginning of the WASTE MAIN exploration drift.

The recommended configuration for safety, ventilation and operationalflexibility, is configuration #2, the parallel drift scheme. Even thoughthe total excavation footage is much greater, due to the considerableincrease in efficiency, the impact on cost and schedule are notexcessive. The small increases in excavation cost and schedule will beregained when and if repository construction starts, since the addeddrift and cross-cuts follow repository alignments. Also, the ventilationoperating costs will be considerably less with this parallel driftconfiguration.

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2.0 "Drifting is to be accomplished as early as practical in sitecharacterization.

To determine schedule impacts, time estimates were made for both thesingle entry configuration and the double entry configuration. The sameequipment spread was assumed for both configurations, with one spreadbeing shared between the two headings in configuration #2.

Also, because of possible ventilation limitations, two different muckloading and hauling systems were considered.

(1) Muck & Haul with 2 - 5 yd3 LHDs only. (Requires less totalventilation).

(2) Muck with 1 - 5 yd3 LHD with ejector bucket, loading, 2 - 8.5yd trucks. (Requires more total ventilation).

In the ventilation analysis, the worst case scenario was used, and it wasdetermined that adequate ventilation could be provided. Therefore,either system could be used. The LHD and trucks combination would resultin the shortest schedules.

The time estimates are for controlled drill & blast excavation, rockbolting, and geologic mapping. Also, muck sampling for rock matrix,hydrochemistry, and chlorine -36 tests are included. No other testing isprovided for in the estimate.

For accomplishing drifting as soon as practical', drifting toward the"Point F" starting intersection (interface drawing #R07048A/1) is assumedto start as soon as the DBR is finished, ES-2 and ES-i are connected, themuck dump station is fully accessible, and the power center has beenexcavated. This means that exploratory drifting, which is currentlyscheduled to be started after the MTL service core area is finished,would be in progress concurrent with most of the service core areadevelopment.

The estimated times for mining the above pre-drifting MTL developmentwere taken from FS-ST-0024, Design Mining Rates.

2.1 SCHEDULE

2.1.1 Following are the estimated times required to complete the additionaldrifting.

2.1.1.1 Single Heading and Passing Bays - 9,780 ft

(a) Using LHDs only, to muck 788 days

(b) Using LHDs and trucks, to muck 701 days

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2.1.1.2 Double Heading and Cross-cuts - 20,016 LF

(a) Using LHDs only, to muck 817 days

(b) Using LHD and trucks, to muck 723 days

2.1.2 Minimum pre-new-drift development time

2.1.2.1 Drive DBR, ES-2 to ES-1 connection, ES-2 muck dump run around, andpower station alcove 162 days

2.1.2.2 Drive currently planned exploration drift to Pt-F 67 days

2.1.2.3 (Required for parallel heading option only). Drive ventilation driftfrom SD #4 near ES-1, to Pt-F.

14 days

2.1.3 Total pre-new-drift and additional drift drifting time.

2.1.3.1 Single heading and passing bay - 9780 LF of additional drifting

(a) Using LHD only, to muck new drift* 162 days + 67 days + 817 days - 1017

(b) Using LHO & trucks to muck new drift- 162 days + 67 days + 726 days - 930

2.1.3.2 Double heading and cross-cuts - 20,016 LF of additional driftin

(a) Using LHD only, to muck new drifta 162 days + 67 days + 14 days + 817 days - 1060

(b) Using LHD & trucks to muck new drift- 162 days + 67 days + 14 days + 723 days - 966

2.1.4 Total Schedule Impact

In FS-ST-0024, Design Mining Rates, it was estimated that the MTLcore area development test bed mining, and exploratory drifting,would take 19.5 months. 19-1/2 months x 30 days/mo - 585 days.

The impact on the total construction schedule, for the additionaldrift to be accomplished "as early as practical" would be the totaldays listed under 2.1.3, minus 585 days.

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2.2 HOISTING CAPACITY

2.2.1 Tons per day produced by additional drifting

2.2.1.1 Single heading

(a) Using LHDs only, to muck - 127 tpd

(b) Using LHD and Trucks, to muck - 143 tpd

2.2.1.2 Double heading

(a) Using LHDs only - 233 tpd

(b) Using LHD and trucks - 263 tpd

2.2.2 Tons per day produced by concurrent work on MTL.

In FS-ST-0024, the maximum rate of production was when MTLexploratory drifting was being done concurrent with test driftdevelopment. The peak rate of production was calculated to be 765tons per day. This only lasted for 10 days, and then tapered off ashaulage distances increased.


2.2.4 Hoist Capacity

In FS-S1-0068, the maximum hoisting rate for the GFE 1500 HP doubledrum hoist planned for ES-2, was determined to be 228 tons per hourto 249 tons per hour, depending on skip and counterweightconfiguration. Using the lower rate of 228 tons per hour, themaximum tons per day that could be hoisted with this hoist, if noother use was required, would be about 18 hrs per day x 228 tons perhour - 4100 tons per day. This hoist will not be available for muckhoisting for a considerable amount of time each day, due to therequirement for personnel, materials, and supplies hoisting.Therefore, the impact on the hoisting system can be stated as thepercentage of total theoretical hoist capacity required for muckhoisting.

2.3 MINING EQUIPMENT REQUIREMENTS IMPACT

To start the additional drifting concurrent with presently planned work,the following additional mining equipment would be required.

2.4 MINING PERSONNEL

One more face crew would be required each shift.


3.0 "Drifting is to be accomplished after completion of the currently planneddrifting for ES underground tests."

The total time in this option, for each configuration and muck handlingspread, is merely the total additional drifting times listed in 2.1.1plus the 585 day MTL development time determined in 2.1.4. An exceptionis with the two parallel heading configuration, the 14 days for the extraventilation drift has to be added in.

3.1 Total time schedule for MTL currently planned development plus theadditional drifting.

3.1.1 Single Heading and Passing Bays, 9780 ft additional drift.

(a) Using LHDs Only

585 + 788 - 1363 days

(b) Using LHD and trucks

585 x 701 = 1286 days

3.1.2 Double Heading and Cross-Cuts 20,016 ft additional drift

(a) Using LHDs Only

585 + 14 + 817 - 1416 days

(b) Using LHD and trucks

585 + 14 + 723 - 1322 days

3.2 Total Schedule Impact

The total schedule impact is the additional drift time, since this optionassumes doing all of the new drifting after the currently planned work isdone. With the double heading configuration, the 14 days for driving theadditional ventilation drift, must be added.

The schedule impacts are:

3.2.1 Single Heading

(a) Using LHDs Only 788additional days to complete MTL excavation

(b) Using LHD and trucks 701additional days to complete MTL excavation


3.2.2 Double Heading

(a) Using LHDs Only

817 + 14 831Additional days to complete MTL excavation

(b) Using LHD and Trucks

723 + 14 737Additional days to complete MTL excavation

3.3 Other Impacts

The impacts on the hoisting system, mine equipment spread, and mine crewsize, discussed in the schedule for additional drifting to be done duringpresently planned MTL development, will not occur in this schedule.Hoisting requirements, equipment and mine personnel requirements willdiminish in this option, compared to the requirements of the currentlyplanned work.

4.0 "What additional impacts, if any, result if this work is accomplishedconcurrently with drifting in the Calico Hills?"

Drifting concurrently in the Calico Hills will be done through ES-1shaft. The main impact this will cause will be to deny the use of ES-1for personnel, material, and equipment hoisting, related to MTLdevelopment. Since the impact on the ES-2 hoisting system, caused byadditional drifting on the MTL, would not be too great, the impact oflosing the use of ES-1 should not be serious.

5.0 "What potential scope of work and schedule can the presently plannedexploratory shaft facilities support?"

The presently planned ESF can support itself plus the additional driftingon the MTL and Calico Hills level being investigated in this impactanalysis. To determine what additional work can be supported is notpracticable without defining the additional work under consideration.

6.0 Electrical Impact

Analysis Scenario: 10,000 ft exploratory core drifting and add CHDRlevel with 1000 ft drifting. (worst case)

Impact: The following list is the change in equipmentnecessary to handle the approximately 3900 H.P. ofventilation and mining to supply the exploratorydrifting. Overall electrical costs will increaseas additional equipment is added.


o Possibly, 2 larger cables per shaft at 4.16kV

o Larger 5kV U/G mine power switchgear of an additional power center

o Increase in number of power cabling in drifts

o Possibly, 1 to 2-5kV medium voltage starters

o Possibly, 10 - 4.16kV - 480V step-down transformers

o Associated 480V switches, etc.

o Larger mine power center alcove due to increase in switchgear

o Possibly, two additional cables per shaft at 4.16kV

This scenario may possibly impact H&N's equipment sizing for the surfacesubstation transformer and switchgear and the stand-by generators.

7.0 Conclusion

The addition of a drifting program to explore approximately 10,000 ft. tothe SW edge of the repository block, would not have any prohibitiveimpacts on the presently planned ESF design construction, and testing.Depending on when the additional drifting was done, i.e. concurrent withor subsequent to the presently planned development and testing, impactsto some systems would result.

If the work is done concurrent with presently planned work, moreventilation capacity, electrical power capacity, utilities, undergroundmining equipment, and provisions for human occupancy, would have to beprovided. The hoisting plant would not have to be redesigned. Theschedule for the completion of the presently, planned development andtesting would not be significantly affected. The impact of providing theincreased capacities listed above, could easily be mitigated in Title IIdesign.

If the additional drifting was done after the presently planned ESFprogram is complete, very little adverse impact would result.

The over all schedule for completion of the ESF, including the additionaldrifting, would receive the greatest impact, in that this schedule wouldbe increased by from 345 to 830 days, depending on the drifting schedule,configuration, and equipment spread.

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ATTACHMENT 1

Exploratory Drifts

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SECTION A-A DRILL ROUND

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ATTACHMENT 2

Excavation Cycles - Exclude mucking of differing haul distances, use 1 Hydr.,2 Boom Jumbo and 1 - 5 yd LHD, ea. heading

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Exploratory Drifts

ATTACHMENT #3 Page 73 of 101

HOIST DUTY CYCLES

GFE 900 HP YULCAN DENVER - GFE 1500 HP ALLIS CHALMERS

ATTACHMENT #4 Page 74 of 101

FS-ST-0024 - DESIGN MINING RATES

CORE AREA MINING

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Muck Cycle

Don't have access to the loading pocket from the NS of ES-2. Haveto dump into temporary conveyor to transfer muck around shaft tomuck pocket.

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of 101HAUL DISTANCE

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ATTACHMENT 5

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Concurrent work status (expl, D only)

Drive imbricate fault drift NW to intersection with tuff main duringfirst 37 days of driving the imbricate fault drift SE to target,which takes 103 days. Then the imbricate fault drift SE willcontinue on another 103-37-66 days concurrent with the next leg ofexploratory drifting.

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ATTACHMENT 6

Concurrent with the last 69 days of DHW drivage, drive tuff mainsouth to intersection with ghost dance fault drift (PT F), and turncorner and begin driving GHD drift west.

Have 69 days left for concurrent work.

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GHOST DANCE FAULT

EXPLORATORY DRIFTING

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AVG. HAUL DISTANCE

impact analysis on esf design ympo action item #88-1995

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